Tube threading die stock



Nov. 14, 1933. L.. sUs'sMAN TUBE l'IIIRELDINGr DIE STOCK 2 Sheets-Sheet l l a #Fmr ATTORNEYS Nov. 14, 1933. SUSSMAN 1,934,777

TUBE THREADING DIE STOCK Filed Aug. 9, 1930 2 Sheets-Sheet 2 Y 27 Z/.lL El. L 2i v l l TOR 3/ sa/v Sass/MN "ga, @um

ATTORNEYS ..25 Yiiattened as indicated at to provide a non-circular externalsurface onV 45 order to, facilitate 'the introduction of thesleeve Y Patented Nov.,1'4,"1933 1,934,771? TUBE 'rnREAnlNG DIEsTOCK :Leon Sussman, Bayonne, yN."J.assignor of onehalfto Joseph. F. Wilglus,

Elizabeth, N.- J.

. Application August 9, 1930,-y serial Nq. 474,119

' invention' relaxtthreads and has for of novel construction to Vdies forcutting screw its .object to provide a die ting threads upontubes'made of very thin metal ing to deform said tubes.,

. Vpart ofthe device. n,

' f As shown in the illustrated'example,.thetube without-subjecting the'same to any strainstendobjects will Vappear from Y. inafter. andk the features of Vout intheclaims.

AIngthe accompanying drawings, which illus-f trate anexample of thef-inventionwvithout deplan vview of ythe he description here- Y.n'ingo-its limits, Fig.'1 ,is a noveltube threading die; Fig. Vontiieline 2 2 of Fig. l;v Y iviewifin the line 3 -3 of. Fig. 1; Fig. 4 is a longitudinalsection onvthe line A1- -1 of 4Fig. llig. .5 is. an. end View with partsbrolen away; Fig. .6. isa similar'view withparts brokenaway to Fig. 3 Iis* a similar showA the internal construction, `and Fig. 7 is av perspectivev View illustrating@ sleeve whichl forms threading dier comprises an externally threaded .tubular 'member-'-1{).terrriinating at-one end in a v.split ring 11tle outer surface of which is 12 or otherwise formed `said ring 11; the latter is split as .indicated at '13 so as to provide a certain amount ofinherent resiliencyinr said-ring 11 for jthe-purpos'eto be more. fully described hereinafter.` TheV inner` diameter-of the member 10. andi-ing `11 correspends. to the fexternal diameter ofthelargest indicated at1 15 and having size A of tubing for V:which the die is designed.` To adapt the Vdie toaccommodatetubingoflesser diameter,=onejor more `sleeves'li maybe pro- -viled said `sleeves being. longitudinally split as V preferably. corresponds to the` combined axial ,-lengthof themember 1Q and ringl-l. The ex,- ternal diameter of` Atire/sleeve 14 is such. that the,Y member' 10. and.n the ring 1 1, while the 1internalidiameter thereofA correspondsjto the tube 16. which-it is .intended yto accommodate. Y In 14; into the ring l-11, and member-110, saidsleeve I1 7,.the.fouter .surface of ,which v is preferablyr lnurled to facilitate manipulation of Y the sleeve 14; thev flange 17 .byl engagement 'withjthe -free .end surface of` thering 11 alsoservesas'a stop to properly positionthev sleevej1flwithinfthe adapted especially for cute,

. Other Amore specific' novelty will be pointed 2 is aA cross-section an axial length which l s claims. (o1. 11i-123) In *order to fix-the sleevezin position in thev y member 10 kand ringll, a Aset screw` 18 may be provided in the ring V11, asV illustratedA Figs. 1 and 2. The devicefurther comprisesa cut'- ting head 19, sl'laped for instance as indicated in Figs. 5 and 6, and provided with guideways l 20 `which preferably are arranged in tangential relation to the axis of the die, or,'in other words areslightly off the direct diagonal, as illustrated in fFig's.l 5; and 6.x Cutting jaws or chasers/21 ends preferably Arounded for the purpose which will appear more fully. here-A inafter. AnV internally yscrewthreaded extension 22 projects in an axial direction'A from the cutareslidably mounted in the guideways'20 and have their o ut'erY ting` head 19 into threaded engagement with 'the f tubular member 10 and isrotatablethereon to progressively travel Alengthwise of,v said tubular member 10 in accordancewiththe progress of the' thread cuttingoperation, asy will bev` more lIn addition to the parts so far described, the thread .cutting die includes a collar-23 rotaably mounted upon the' extension 2 2 and including a section. 24 'of relatively larger diameter which projects over the cutting head 19, as shown in Fig. 4. Thesection 24 of the collar 23,is .pro

vided vwith Ainternal camsurfaces 25 eccentricto the aXis' of the die and with correspondinglyl eci centriccam grooves'26, as shown in Figs. 5 and 6. The cutting Vjaws or-chasers 21 have their outer curved ends in abutting engagement. with the cam surfaces 25 :and areprovided with'pins or equivalent projections 27 which extend through suitable openings 28 in thecutting head 19 into the cam grooves 26, as illustrated in'Fig. 4. An

end or cover plate'29 is secured Vto the cutting'- head 19 bymeans of screws 30 andV projects out- ,wardly'r over the peripheral end Asurface ofthe extension 22V for thepurpose of maintaining the cuttingV jawsy Y21 in Y proper position in the guidevvways 20; asshown in Fig. 4; the cutting'jaws 21 thus lie .between the end surface of Vthe` cut'- ting `head 19 and the inner surface of "the end plate 29. Withthis'arrangement, as thev collar vwardly bythe actionV of the cam surfaees-f25 upon Vthe curved end thereof'andoutwardlyinsaid guideways'by the action of the cam grooves' 26 -upon'the pins 27 or their equivalent. By-hav# lingfthe outer ends'of thejawsin-abutting en;

gagement withthe cam surfaces 25, said jaws are'k rmly zxed' against unintentional outward ln iovement during the thread cutting, operation.

lofo H23. `r and V`its Y section, 24 are A rotated yrelatively f to 4the` extension 22, the jaws'21will be moved in' clearlyexplained further on inthe description.

To facilitate the rotation of the collar 23, the outer surface of the section 24 thereof may be knul-led, as indicated at 248. Any suitable means may be provided for locking the collar 23 and its section 24 against movement to fix the jaws 21 in a set position; for instance, a locking screwl may be provided for this purpose and extend through a slot 32 formed in the collar 23, as shown in Fig. 1 into screw-threaded engagement with an internally threaded aperture provided in the extension 22 to receive the same. The locking screw 31 is provided with an annular shoulder 33 adapted to bear against a clamping shoe 34, which is slidably iitted upon the collar 23 in registry with the slot 32 thereof, as indicated in Figs. 1 and 4." It will` be obvious that as the screw 31 is screwedinto the openingof the extension 22 the shoulder bear against the shoe 34 and thereby cause the latter to exert a clamping pressure on the collar 23, vwhich prevents unintentional movement thereof from any adjusted position. For the purpose of indicating the size of tubing for which the jaws 21 are set, the collar 23 may have its free edge bevelled as indicated at 25 and provided with indicating marks 36 adapted to co(- operate with an indicating mark 37 produced upon the extension 2 2'. Figure designations 38 may be produced upon the collar 23 in juxtaposition to the indicating marks 36 to Avisibly designate the size of tubing to which said marks relate. Vice is adaptedto cut threads upon threel different sizesof tubes Vhaving diameters respectively of one and one `quarter, one and threeV eighths, and one and one half inches; it will be clear that the die may be designed tocut threads upon either a greater or lessernumber `ofdiiiferently dmensioned tubes, without` in any way aifecting the operation o r efficiency of the device. To fa'- cilitate the operation of the cutting jaws, the extension 22 may be provided with handles in the form of rods 39 projecting outwardly from said extension 22 in opposite diagonal directions, as illustrated in Fig. 2; these rods 39 are pref,- erably detachably connected with the extension 22 to facilitate the assembling of the die.

In the illustrated example, the jaws 21 have been set to cut .threads upon tubes 16, which have an external diameter of'an inch and one quarter. VAsleeve 14 of vcorresponding diameter has accordingly been inserted into the co-axial bore of the ring llland tubular member 10 and secured therein by the set screw 18, preferably with the slit 15 in registry with one of the slits 13 of the ring 11, as shown in Fig. 2.v In practice Vthe tubular member 10 is then rotated relatively to the extension 22 or the latter is rotated relatively to the tubular member 1 0 so as to cause the latter to project from said extension 2 2 to an extent corresponding to the amount of thread which is to be cut upon the tube; if the'thread to be cut is of greaterextent thanthe threaded length of theextension 10, the'latter is simply unscrewed from the extension 22 as far as possible, and the threading operation isperformed in successive steps by re-adjusting said tubular member 10 and the tube 16 until the desired amount of threading has been accomplished.

After the 4tubular member 10 has been initially" set ini the manner set forth, the tubelvtofbe threaded is inserted either directly into the coaxial bore of the ring 11 Vand member 10, or into the bore of the sleeve 14, as inthe illustrated 33 will' rcutting dies.

Thus, in the illustrated example, the de-V device in position and at the same time causes` thering 1l and the sleeve 14, if the latter is' included in the operation, to develop a clamping action upon the tube 16, which is to be threaded. The splits 13 and 15 are so dimensioned and designed that the clamping forces developed upon the tube 16 while amply suiiicient to hold said tube against rotation during the thread cutting operation are not strong enoughto deform said tube 16v in any way. This is of extreme importance in the cutting of threads upon very thin tubing, such as wastepipes, which, becauseof their thinness, are easily deformed and accordingly are diicult to thread with ordinary thread After the device has been clamped in. the vice 4G -or y is ready for the thread cutting operation and the extension 22 with its associated elements is accordingly rotated by means of the handles or rods 40, or in any other convenient manner. As

this operation takes place, the threaded engagement between the extension 22 and the tubular member 10 causes said extension 22 to progres-V sively travel lengthwise of said tubular member 10, and at'jthe same time, rotates the'jaws 21 in thread `cutting engagement with the tube 1 6 and causes them to progressively cut the thread upon said tube 16, as will be evident; in other words,` in the operation of the die, the extension 22 travels lengthwise ofthe tubular -mvember 10 its equivalent, the apparatus in lexact accordance With the progress of the threadA cutting operation, it being understood that the pitch of the threadsof the tubular member 10 and extension 22 corresponds to the pitch of the thread being cutlby the jaws 21. When the extension 22 reaches the ring-11 so that further progress upon the tubular member Y10 is impossible, the device may be re-set for further threading by'simply causing the extension' 22 andits associated elements to travel in a reverse direction upon the tubular member 10 and tofthen advance thetube 16 a suiiicient distance to bring the terminus ofthe initially threaded section into registry with the cutting jaws 21, whereupon the previously described operations may be 'repeated. This're-adjustment repeated as often as may be necessary to produce the desired amount of thread' up'on the tube '1 6, If the amountof thread to befcut upon the tube Y16 is less than the axial length ofV the tuoi' the parts *mayl be bular member 10,-the extent to whichfthisfmember 10 is exposed `relatively to the extension 22 will clearly'indicatelthefexact amount of thread which Vwill be cut'upon thetube 16 bythe time i thefextension 22 reaches thefring Q11. The'tubular member'vldand thering either 'alone or in en -'operation Vwith,t he, sleeve 14, serve to steady the tube 16 and, to hold it absolutelyin aY true position during the threading operation,

so that the cutting of the thread. is v ery acjandat the same time is of maximum efficiency in' operation and provides a threading die which may beemciently utilized for cutting threads vcurateand'conseojuently permits thecutting of kfor the cutting of threads upon'very, thin tubing,

which is easily deformable.

Various changes in the specific forms shown and described may be made within the scope of the claims without departing from the'spirit of the invention.

I claim:

1. In a tube threading die including an externally threaded tubular member adapted to receive the tube to be threaded, a ilattened split ring constituting an axial extension of said tubular member beyond the operative range of the die and adapted to be secured in a vise to x said tube in position forrthreading and to protect thesame against deforming stressesV developed by said vise, the combination of a cutting head provided with guideways tangential to the axis 4of the die, an internally threaded extension projecting from said head in threaded engagement with said tubular member and rotatable thereon to progressively travel lengthwise of ksaid tubular member in accordance with the progress of the thread cutting operation, a collar rotatably mounted upon said extension and projecting over said cutting head and provided with internal cam surfaces and corresponding cam grooves,

cuttingv jaws mounted in the guideways of said head in engagement with said cam surfaces, pins carried by said jaws and extending into said cam grooves, said collar rotatably shifting said cam surfaces and cam grooves to adjust saidjaws to different cutting positions, and radially extending means for locking said collar against move'- ment whereby said jaws are xed in the set'position.

2. A tube threadingdie comprising an externally n threaded tubular member adapted to receive the tubey to be threaded, a flattened split ringconstituting an axial extension of said tubular member beyond the operative range of the die and adapted to be secured yin a vise to x said tube in position for threading and to protect the same against deforming stresses developed by said vise, a cutting head provided with guideways fangen-- tial to the axis of the die, an internally threaded extension projecting from said head in threaded engagement ywith said tubular member and rotatable'thereon to progressivelytravel lengthwise of saidtubular member in accordance with the progress of "the thread cutting operation, cutting jaws mounted in the guideways of said head, and means for setting said jaws in diierent cutting positions dependent upon the diameter of thev tube to be threaded.

3. A tube vthreading die comprising an externally threaded tubular member adapted to receive the tube to beV threaded, a'attened splitring con- `stitutingan axial extension of saidA tubular mem- 

